Khan Alp-Qutlugh of Mongolia

Khan Alp-Qutlugh of Mongolia (725-789), born Tun Bagha Tarkhan, was the khan of the Uyghur Khaganate from 779 to 789, succeeding Khan Tengri Bogu of Mongolia and preceding Khan Tolossu of Mongolia.

Biography
Tun Bagha Tarkhan was born in 725 to the Yaghlakar Uyghurs, and he was a Manichaean after the state religion was changed from Tengrism in 762. He was the son of Khan Qutlugh I of Mongolia and the brother of Khan Bayanchur of Mongolia. During the reign of Bayanchur's son Khan Tengri Bogu of Mongolia (759-779), Tun Bagha served as an adviser as his uncle. Tengri Bogu planned an invasion of China in the wake of Emperor Dezong of Tang's accession at the advice of his Sogdian strategists, but Tun Bagha, who was sponsored by the Tang ambassador, killed his nephew and massacred 2,000 people from the khagan's family, his clique, and the Sogdians. Becoming known as Alp Qutlugh Bilge (victorious, glorious, and wise), he enforced a new set of laws, and he also conquered the Yenisei Kirghiz. On his death, he was succeeded by his son Khan Tolossu of Mongolia.